To be clear, I don't think that it's a right vs left thing. I think that social media incentivizes people to behave poorly. Ben Shapiro had an enlightening discussion with a founder of Vox about the nature of polarization [1], but that's not why he's famous or how he makes money. His audience wants to see him bash unprepared liberals, so that's what he's going to do. Even if he doesn't, some other pundit will simply take his place.
As a former Mormon missionary, I couldn't disagree more. I didn't meet many people who were interested in the Mormon church, but I didn't consider them evil. If anything, it was my views on my religion and personal spirituality that evolved enormously over the course of the two years, far more than the 19 years previous or the many since. I learned a lot about myself and my worldview. Certainly a lot more than anyone changed their worldview by talking to me.